Dual fuel-supply system



June 16, 1925. 1,541,851

w. M. RISTAU JR DUAL FUEL SUPPLY SYSTEM Filed Aug. 3, 1924 INVEN TOR.

1* 6 H By (19' Q bTTORNEY.

1;; OFFICE.

.szuJf-Efii], 33., F FEEDERECKSBU'RG, TEXAS.

DUAL FUEL-SUPPLY SYETEM.

:zi slmrg'. in UN: 1.

l Slate of res have ii certain new and nsci'nl Improvements in Will Funkoh the following is This invention relates to :1, dual fuel supply 'siemdcsigmccl primarily use in connection with internal combustion motors ofmolc" vehicles and aeroplanes, but it is to he unti. 'rsiood that s fuelsnpply system in ncconhn'we with this invention, i he em- {)lflfVQLl forany purposes forwhieh it is found applicable, and the invcntion";1s foritsohii-zgi. izo prni'ide, in manner as irreinzifitcr iicill oi theclass with a pair of fuel sn 'ply nicclmnisn'is no molly closed to aninhlko manifoid common herein and each including a. carburetor mlnplwiis connnnnicalc with such manifold and with each of id czn'hnretersindecni'lcnlly ronlrl is provide for the utilization of one to supply 4bile the other is Llonnant. Under i comliiions if one of the carhnrctcrshas become impairs-i" or clogged ihe other carburetor can he.immedinteljnlilized to supply fuel in prevent discontinuance of thooperation of the .noior and to overcome for Further objects of the,invention are to provide, in a manner as hcreinn fter sci forth, :1llllill h 1 supply SFSLR: which is simple in its mnstruc'iion andarrangement, strong, lllll" l compact, thoroughly eliicient'nml n5; iuse, readily in allcd; anii niively inexpa'nsive to sci up.

' m and oiher objects in {he novel n and ngeznent more specincnily lls\l in the iiiicoinpmz ,Eng shown an 'flbil'mill lfilli. if is in bemiller vaninimns am? will...

sch some within he can in: r scope of the claims hcreunto iijlpfiu Inthe drawings who: I: like characters rlcnole lhrnughmit the several i1;

Flynn? 'l is a fra'nncnl's dual fuel supply invention.

Fi ure *2 Figure 3 is n fragmentary View, in plan, of rho air controlmechanism.

Figure 4 a perspective View of the throttle valves and the controllingmechanism lhcrei'or.

Figure .3 perspective view of the air controlling valves and theoperating mechanism therefor.

Figure l; is a detail illustrating a closure plziic for the infnkemanifold when one of the carbnrcters disconnected.

Referring to the drawings in detail, 1 denotes an intake manifoldleading lo the (.Iv'lilltlfS of a motor and which at its outer end isprovided with a pair of branches '2, 3.

Two cnrlmrelers of known construction are employed and when one is;active, the other is L :nmnt and by this arrangement if the nativecarburetor becomes impaired or clogged the other carhurcter can beplaced in active position, under such conditions giwnvivlinn for thenecessary supply of fuel to cause 'he continuance. of the operation ofthe mohir. (hie of the carburcters is inclicar d 2i. 4 and the other at5.

The cox-laurel r 4 is provided with a fuel supply pipe e, which isdetachably connected to lhe branch 3, at 7. The carburetor is providedwith a fuel supply pipe which is detachably connected to the branch 9;,as at 9.

Leading from the carburetor 4 and (lecnrhnrefer and (lctnchablyconnected with the coupling 10 is an air supply pipe 12.

Connected to lhe coupling 10 is an air feed pipe 13.

By setting up he carburetors in the man oer siaaecl wiih respect to thebranches 2. 3 and co filing 3.0, i he carbureters can b: removed '5occasion.requires. If a carlnncicr 1. lat -chad from one of the branchesof in: intake 1, the said branch is closed by a: c? sure plate 14, seeFigure 6, which is ilzl? lili)l} scentedv in position.

lmsding from :51 gasoline reservoir to he carhnrcierj, is ieeifl pipe 16having wsed zherein a controlling valve 17. ont-l the gasoline. 1scrvoir 15 to 5., a feed pipe 33 having his-en il'zcifiin e controllingvalve. 19.

Extendin dizrmeirically of the pipe 6, in proximity to {he eml th m 1'5,which is co! i lo Ylsc hranch as Well being journalled in said pipe 6,is a valve actuating shaft 20, carrying a throttle valve 21 which isarranged in the pipe (land provides means for controlling the passage offuel through the pipe 6 to the branch 3. The shaft 20 projects outwardlyfrom the pipe 6 and is formed. with a. crank arm 5:2 to which isattached one end of a pulling spring 23. The other end of the spring 23is anchored to the pipe 6. The function-of the spring 23 is to normallyretain the valve 21 in closed position and when the shaft 20 is actuatedto open the valve 21, the mo ement of the shaft 20 is had against theaction of the spring so that when the shaft is released the spring 23will. rock the shaft. 20 in an opposite direction and close the valve.Suitable means is provided in the pipe 6 to limit the return move mentof the valve L, due to the action of the spring 23. i

The shaft 20 projects inwardly with respect to the pipe 6 and at agreater distance than What it project-s outwardly with respeot to thepipe (3, and the said inner projeoting portion of the shal extendsthrough a hearin Ql provided on the lower end of a hanger arm 25, whichdepends from a bracket :26 secured to the intake manifold l. The innerend of the shall; 30 ca rics a curved crank arm 27 provided with ahifurcatcd upper end llxtcnding diametrically of the pipe 8, inproximity to the end thereof which is connectcd to the branch 2, as Wellas being' journalled in said pipe 8, is a valve actuating shaft 29,carrying a throttle valve 30,

which is arranged in the pipe e and provides means for controlling l'lllpussage of fuel through the pipe 8 lo the branch 2. The shaft 21)proicvts out Wardly from the pipe 8 and is formed with a crank arm 31 towhich is attached one end of a pulling spring 39. The other end of thespring IE2 is anchored to the pipe 8; The function of the spring 313 toretain the valve 31') in closed position and when the shaft 29 isactuated to open the valve 30, the movement of the shaft 29 is hadagainst the action of the spring 32 so that when the shaft. .29 isrclcasvd the spring 2;; will rock the shaft in an opposite direction andclose the valve lid Suitable means is provided in the pipe 8 to lim tthe return movement of the valve 30, due to the action of the spring2.12. The shalt 25) projects inwardly with respect to the pipe 8 and ata greater distance than what it projrvts outwardfv with respect to rhopipe 8, and the said inner projecting portion of the shaft 29 extendsthrough a bearing $.3 providcd on the l() r end. of a hanger arm il-l,which depends from the bracket 36 SQ- cured to the intake manifold l.The inner end of the shaft 39 carries a curved rraul;

arm provided with a bifurcated upper end 37.

The curved crank arms 27, 36 are opp-a sitely disposed, with respect toeach other so that the bifurcated end of the arm 27 projects in adirection towards the bifurcated end 537 of the arm 36. The arm 27curves in an opposite direction with respect to the curvature of the arm36. See Fig ure 4 The valves 21,, ill), crank arms 92, S2 and the curvedcrank arms 27, 36, are so set up that when the arm 27 is shifted to openthe valve 91, the action of the spring; will cause the closin; of thevalvrill. lVh-en the arm 36 is shifted to open ti valve 30, the actionof the spring :23 will cause the closing of the valve 21.,

A shifting element, common to the arms 2], 38, is employed and saidelement is T- shaped in contour and. consists of ZLSLGHI 38 providedwith a head 39, which is positioned between the curved crank arms 27 and36.

if the shifting element is moved in the direction of the arrow A, Figure4, the head :32) will engage the arm 36 and move it to the positionshown in Figure 4, whereby the valve &0 will be shifted to openposition. ll the shifting element is moved in the dirrc-tiou of thearrow 3. Figure -l, the head 1?. will rng'rlgi'o the bifurcated end ofthe arm :37, thcrchy actuating, the shaft 20 to open the valve i l, butas the head 29 is moved from engagement with the bifurcated end 31' ofthe arm So, the spring 32 will shift the shaft 2 to close the valve 30.When the arm as is in a position to align w th the arm :27, the valveswill be closed. 'lhc stem 38 of the shifting element travels through ahanger arm ll), which depends fri'un the bracket 26.

Arranged within the pipes ll and 12 are air cont rolling valves ll, 42respectively and Odill of whir-u is carried by a vertically disposed atuatingslnil't 43 which extends diauiclrir-ully of the pipe. as well'asbeing journallcd llHi'LllL lach of the shafts 415 projects a subnautialdistance above its irspcctive pipe and the latter has suitable meanstherein for limiting the closing movement of the controlling. valve. lixedly secured to the upprr end of each of the shafts l3, cxtcriorlv ofan air supply pipe, is an :znglwshapod member forrzzeol f a horizontallydispo ed leg: ll and a vertically dis- PU UKl lea l5. The vertical logof each of said members is provided with a transverse groove ll). andthrgroove 46 on one member is oppositely disposrd nith respect to thegroove on the other member. Connected to the "vertical log of each ofsaid members is a controlling; spring l2. The said controlliue' spring-sextend in opposite directions and are anchored to lugs l8 rarried by thevolmliliii' l0. 'lhrangle-shaped members lvo provide mass foralternately operating the alves 41, 42, or in other Words, when the alve41 is moved to open position the valve 3 is shifted by its controllingspring to losed position.

The angle-shaped memliers are alternately operated through the medium ofa T-shaped shifting element comprising a stem 49, and a head 50. Thestem 49 extends through an aperturcd support 51 carried by the ,coupling10. The head 50 normally positioned in the grooves 46 of the verticallegs 45 of the angle-shaped members, and when these latter are in normalposition the vertical legs thereof oppose each other. \Vhen thecontrolling element is shifted in the direction indicated by the arrowC, Figure 5, the valve 12 will be moved to open position and the valve41 retained in closed position by its controlling spring, and when theelement is shifted in the direction of the arrow I), Figure 5, the head50 will engage the angles-ha ved member carried by the shaft of thevalve 41 and will move the valve to open position, but as the shiftingelement moves in the direction 015 the arrow D, the controlling springof tile valve 42 will move the latter to closed position. Stops 51' areprovided for limiting the return movement of the angle-shaped memberscarried by the shafts 43.

Any suitable means can be employed for maintaining the stems 38 and 49in the position to which they have been shifted.

The foregoing construction of dual fuel supply syst m provides meanswhereby each carlmrcter is imlcpcndently controlled and if onecarburetor should become clogged or damaged, the other carhureter can bethrown into action. or it one of the carburetors is removed the othercarburetor can be utilized for supplying the necessary fuel to themotor, and it is'thought that the many advantages ol. a dual fuel supplysystem in accordan e with this invention can be read ily understood, andalthough the preferred construction is as illustrated and described, yetchanges in the details of construction can be had which will fall withinthe light of the invcntion as cla'in'ied.

'hal. I claim is: A

l. A dual fuel supply system conmrising a pair of carburetors eachprovided with an air inlet pipe and a l'uel supply pipe and means forindependently and dctachably connecting it to the intake manifold ol amotor, a spring controlled throttle valve mounted in each of said supplypipes, a spring wntrolied air controlling valve mounted in each of saidair inlet pipes, means shitting in opposite dircclimis and common tosaid throttle valves for opcrah iug' one imlepemlcnlly ot' the other,means connnon to said air controlling valves: for operating oneindependently of the. other and an independent valved gasoline feed pipeleading from a common source to each carburetor.

2. A dual fuel supply system comprising a pair of carburetors eachprovided with an air inlet pipe and a fuel supply pipe and means toindependently and detachahly connect it to the intake manifold of amotor, a spring controlling throttle valve mechanism mounted in each ofsaid supply pipes and having its stem formed with a curved crank armarranged exteriorly of said pipe, said crank arms arranged in spacedrelation and oppositely disposed with respect to each other, meanscommon to said arms for-operating one of said mechanisn'is independentlyof the other, a spring controlled air controlling valve mechanismmounted in each of said inlet pipes and each provided with anangleshaped member exteriorly of said pipes, and means common to saidmembers for operating one of said air controlling valve mechanismsindependently of the other.

3, A dual fuel supply system comprising a pair of carburetors eachhaving means adapted to be detachably connected to and independentlycomnmnicate with the intakt manifold of an engine, a throttle valvemechanism mounted in the said means of each of said carburetors, an airvalve controlling mechanism for each of said earburcters, means shiftingin opposite directions and common to said throttle valve mechanisms foropening one independent of the other, thereby providing for the activityof one of said carburetors while the other is dormant, and means commonto said air valve controlling mechanisms for operating one independentof the other.

4. A dual fuel supply system for intemal combustion motors comprising apair of carburetors each having means for independent communication withthe intake n'ianifold of the motor, a normally closed throttle valvemounted in the said means of each of said carburetors, means shifting inopposite directions and common to said throttle valves for opening oneindependent of the other, an air supply means common to saidcarburetors, a pair of air inlet pipes leading from said supply meansand each communicating with a carlmretor, a normally closed air supplywntrolling valve for each of said pipes, means common to said aircontrolling valves for opening one independent of the other, and anindepend ent gasoline supply pipe leading to each carburetor from acommon source.

A dual fuel supply system comprising a pair of carbin-etois eachprovided with an air inlet pipe and a fuel supply pipe and means toindependently and dctachahly connect. it to the intake manifold of amotor, a spring controlled pivoted throttle valve inzninted in each ofsaid supply pipes with pivot of each of saidvalvesextendinghoiizeontally and projecting from. a supply pipe and having its innerend formed with crank arm,"a pivoted spring controlled air controllingvalve mounted in each of said inlet pipes and having the pivot thereofdis posed vertically and extended from the inlet pipe and formedat oneend with an angle-shaped member, means common to said crank arms foroperating one of said throttle valves independently of the other, andmeans common to said angle-shaped members for. operatingone of said aircontro-lling valves independently of the other.

' 6. A dual fuel supply system comprising a pair of carburetors, eachprovided with an air inlet pipe and a fuel supply pipe and means toindependently and detachably connect it to the'intake manifold of amotor, a spring controlled pivoted throttle valve mounted in each ofsaid supply pipes, with the pivot of each of said valves extendinghorizontally and projecting from a supply pipe and having its inner endformed with a crank arm, a pivoted spring controlled air controllingvalve mounted in each of said inlet pipes and having the pivot thereofdisposed vertically and extended from the inlet pipe and, formed at oneend with an angle-shaped member, means common to crank arms foroperating one oi said to tle valves independently oi the other, ineacommon to said angl 3d members for operating one of i 'r J(llll)i'(l.llllg valves independently the fill, and an air supply pipe cenmson toand air inlet pipes '7. A dual fuel supply system comprising a pair ofcarburetors, each provided with an air inlet pipe and fuel supply pipeand means to independently and detachably connect it to the intake 11milold of a motor a spring controlled ivoted throttle valve mounted ineach of said supply pi pes, with the pivot of each ol said valvesextendingconnected to said let pipe and formed at one end with anangle-shaped member; means common to said crank arm for operating one ofsaid throt' tlc valves independently of the other, means common to saidangle-shaped members for operating one of said air controlling valvesindependently of the other, and an air supply pipe common to andconnected to Said air inlet pipes, said means for operating saidangle-shaped members supported at the point of connection between saidair supply pipe andinlet pipes.

8. A dual fuel supply system comprising a pair of carburetors, eachprovided with an air inlet pipe and a fuel supply pipe and means toindependently and detachably connect it to the intake manifold of amotor, a spring controlled pivoted throttle valve mounted in each saidsupply pipes, with the pivot of each of said valves extendinghorizontally and projecting from a supply pipe and having its inner endformed with a crank arm, a pivoted spring controlled aiicontrollingvalve mounted in each. of said inlet pipes and having the pivot thereofdisposed vertically and extended from the inlet pipe and formed atoneend with an angle-shaped member, means common to said crank arms foroperating one of said throttle valves independently of the other, meanscommon to said angle-shaped members for operating one of said aircontrolling valves iiuthnpenclently of the other, and means connectcdwith the intake manifold of an engine for supporting said crank armoperating means.

in testimony whereof, I afiix my sigmalure hereto WlLH ELM M. RISTAU,JR.

